This is a great update. I'm working on a couple of games right now, and these have given me a lot of food for thought. I want to try out Matchless and High Under resolutions. I like Fudge x3; I've actually thought about bringing the Stakes idea into Fudge iself.
In the expansion, I think there's a typo: Under "Match Value" it says "roll a number of four-sized dice..." Is that supposed to be "four-sided" or does it matter what size the dice are?